Merge pull request #42468 from futurejones/remove-community-ci-nodes

remove swift-arm community ci nodes

Author: shahmishal

README.md

@@ -17,8 +17,6 @@
 | **OS** | **Architecture** | **Build** |
 |---|:---:|:---:|
 |**[Ubuntu 16.04 ](https://github.com/apple/swift-community-hosted-continuous-integration/blob/main/nodes/ppc64le_ubuntu_16_04.json)** | PPC64LE |[![Build Status](https://ci-external.swift.org/job/oss-swift-5.1-RA-linux-ubuntu-16.04-ppc64le/lastCompletedBuild/badge/icon)](https://ci-external.swift.org/job/oss-swift-5.1-RA-linux-ubuntu-16.04-ppc64le)|
-|**[Ubuntu 18.04](https://github.com/apple/swift-community-hosted-continuous-integration/blob/main/nodes/aarch64_ubuntu_18.04_docker.json)** | AArch64 |[![Build Status](https://ci-external.swift.org/job/oss-swift-RA-ubuntu-18.04-aarch64/lastCompletedBuild/badge/icon)](https://ci-external.swift.org/job/oss-swift-RA-ubuntu-18.04-aarch64)|
-|**[Ubuntu 20.04](https://github.com/apple/swift-community-hosted-continuous-integration/blob/main/nodes/aarch64_ubuntu_20.04_docker.json)** | AArch64 |[![Build Status](https://ci-external.swift.org/job/oss-swift-RA-ubuntu-20.04-aarch64/lastCompletedBuild/badge/icon)](https://ci-external.swift.org/job/oss-swift-RA-ubuntu-20.04-aarch64)|
 |**[Ubuntu 20.04](https://github.com/apple/swift-community-hosted-continuous-integration/blob/main/nodes/wasm32_ubuntu_20.04.json)** | wasm32 |[![Build Status](https://ci-external.swift.org/job/oss-swift-RA-linux-ubuntu-20.04-webassembly/lastCompletedBuild/badge/icon)](https://ci-external.swift.org/job/oss-swift-RA-linux-ubuntu-20.04-webassembly)|
 |**[Android](https://github.com/apple/swift-community-hosted-continuous-integration/blob/main/nodes/x86_64_ubuntu_16_04_LTS_android.json)** | ARMv7 |[![Build Status](https://ci-external.swift.org/job/oss-swift-RA-linux-ubuntu-16.04-android/lastCompletedBuild/badge/icon)](https://ci-external.swift.org/job/oss-swift-RA-linux-ubuntu-16.04-android)|
 |**[Android](https://github.com/apple/swift-community-hosted-continuous-integration/blob/main/nodes/x86_64_ubuntu_16_04_LTS_android.json)** | AArch64 |[![Build Status](https://ci-external.swift.org/job/oss-swift-RA-linux-ubuntu-16.04-android-arm64/lastCompletedBuild/badge/icon)](https://ci-external.swift.org/job/oss-swift-RA-linux-ubuntu-16.04-android-arm64)|